Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-37705

31
FAUCET Score

CVE-2021-37705 is a critical authorization bypass vulnerability in Microsoft OneFuzz versions 2.12.0 through 2.30.0, specifically when deployed with the non-default --multi_tenant_domain option. An incomplete authorization check allows any authenticated Azure Active Directory user to make authorized API calls. This can lead to read/write access to sensitive data, tampering, and unauthorized code execution on Azure compute resources. With a CVSS score of 10.0 (Critical), the attack requires no user interaction and has high impact on confidentiality, integrity, and availability. There is currently no public exploit code, active exploitation, or significant community discussion reported for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.12.0, < 2.31.0CPE matchmatch criteria
cpe:2.3:a:microsoft:onefuzz:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

10.0CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.42%
Probability of exploitation in next 30 days
EPSS Percentile
82.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0242 is in the 72nd percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: onefuzzFixed in: 2.31.0

Vendor Advisories (1)

pipGHSA-q5vh-6whw-x745critical

Improper Authorization and Origin Validation Error in OneFuzz

Aug 13, 2021

References

github.com / microsoft/onefuzz/commit/2fcb4998887959b4fa11894a068d689189742cb1
PatchThird Party Advisory
github.com / microsoft/onefuzz/pull/1153
PatchThird Party Advisory
github.com / microsoft/onefuzz/releases/tag/2.31.0
Release NotesThird Party Advisory
github.com / microsoft/onefuzz/security/advisories/GHSA-q5vh-6whw-x745
Third Party Advisory
pypi.org / project/onefuzz
Product